http://www.polygon.com/2013/1/7/3849284/piston-valve-steam-box-xi3
The "Steam Box" modular computer announced by hardware maker Xi3 and Valve at CES is codenamed "Piston" and is modeled after the PC maker's X7A line of pint-sized computers, Xi3 reps tell Polygon.
Xi3 brought an early version of Piston to CES, but was tight lipped on details about the hardware currently in development with Valve. Xi3 chief marketing officer David Politis told Polygon that Piston will offer up to 1 TB of interal storage and offer modular component updates, including the option to upgrade the PC's CPU and RAM.
Xi3 wouldn't discuss price for Piston, but commented that the Steam Box is based on its "performance level" X7A offering, which is priced at $999. Xi3 declined to comment on what would differentiate Piston hardware-wise from a standard X7A.
It probably won't cost $1000 but I can't see it being too much lower. I really don't know who this is for. PC people already have their PCs and I can't see people who play on consoles going anywhere near this thing.